I've been trying to learn more of the wetland/edge plants this year, but very few of them stick, so I'm hoping that documenting them this way will fix that.
I believe this might be blunt spikerush, (also called a spikesedge) Eleocharis obtusa, an American native. It's an annual with erect, cylindrical stems. Quite lovely!
I think this is sand spikerush, Eleocharis montevidensis, another native. It's more slender and less robust with a brilliant green tinge. It looked a lot like lawn grass from the water, and then I read (at the Lady Bird Johnson Wildflower Center site) that it is 'good as a lawn replacement for low, wet areas.' This spikerush is a perennial and spreads through runners.
